Electric Circuits: Master Ohm's Law, Resistors, Capacitors, Inductors, and Kirchhoff's Laws

Question 1

Which component in an electric circuit stores electrical energy as a magnetic field?

Accepted Answer

Inductor

Answer

Resistor

Answer

Capacitor

Answer

Transistor

Question 2

In an electric circuit, if the voltage across a resistor increases while the resistance stays the same, what will happen to the current flowing through the resistor?

Accepted Answer

The current will increase.

Answer

The current will decrease.

Answer

The current will stay the same.

Answer

The current will change direction.

Question 3

Which of the following is NOT a type of resistor commonly used in electric circuits?

Accepted Answer

Capacitor

Answer

Fixed resistor

Answer

Variable resistor

Answer

Inductor

Question 4

A capacitor is an electronic component that stores electrical energy in its electric field. Which of the following statements accurately describes the energy storage mechanism of a capacitor?

Accepted Answer

A capacitor stores electrical energy in its electric field.

Answer

A capacitor stores electrical energy in its magnetic field.

Answer

A capacitor stores electrical energy in its gravitational field.

Answer

A capacitor does not store electrical energy.

Question 5

An inductor is a passive electrical component that opposes changes in current flowing through it. This opposition is caused by the inductor's:

Accepted Answer

Magnetic field

Answer

Electric field

Answer

Gravitational field

Answer

Electromagnetic field

Question 6

In a parallel circuit, the voltage across each branch of the circuit is:

Accepted Answer

Equal

Answer

Different

Answer

Proportional to the resistance

Answer

Inversely proportional to the resistance

Question 7

Electric circuits have a wide range of applications in our daily lives. Which of the following is NOT a common application of electric circuits?

Accepted Answer

Generating sound waves

Answer

Powering electronic devices

Answer

Controlling traffic signals

Answer

Measuring temperature

Question 8

The standard unit of electrical resistance in the International System of Units (SI) is the:

Accepted Answer

Ohm

Answer

Volt

Answer

Ampere

Answer

Farad

Question 9

Which of the following is NOT a fundamental component of a basic electric circuit?

Accepted Answer

Magnet

Answer

Current source

Answer

Resistor

Answer

Capacitor

Question 10

According to Ohm's Law in simple circuits, the current (I) flowing through a conductor is:

Accepted Answer

Equal to the voltage divided by the resistance (V/R)

Answer

Directly proportional to voltage (V)

Answer

Inversely proportional to resistance (R)

Answer

Independent of both voltage and resistance

Question 11

In a simple series circuit, the equivalent resistance (Req) is:

Accepted Answer

Equal to the sum of the resistances of all resistors

Answer

Lower than the resistance of any individual resistor

Answer

Higher than the resistance of any individual resistor

Answer

Dependent on the current flowing through the circuit

Question 12

The unit of electrical capacitance is:

Accepted Answer

Farad (F)

Answer

Ampere (A)

Answer

Volt (V)

Answer

Ohm (Ω)

Question 13

Which of the following is NOT a characteristic of an inductor in a circuit?

Accepted Answer

Has inherently low resistance

Answer

Stores energy in its magnetic field

Answer

Opposes changes in current

Answer

Behaves like a capacitor in AC circuits

Question 14

Kirchhoff's Current Law (KCL) states that the:

Accepted Answer

Sum of currents entering a junction equals the sum of currents leaving the same junction

Answer

Total current in a circuit is always constant

Answer

Voltage drop across a resistor equals the product of current and resistance

Answer

Power dissipated in a circuit equals the product of voltage and current

Question 15

A voltmeter is primarily used to measure:

Accepted Answer

Voltage

Answer

Current

Answer

Resistance

Answer

Capacitance

Question 16

In a parallel circuit, the equivalent total current is:

Accepted Answer

Equal to the sum of the currents through all branches

Answer

Lower than the current through any individual branch

Answer

Higher than the current through any individual branch

Answer

Dependent on the voltage across the circuit

Question 17

The electrical power dissipated in a resistor is given by:

Accepted Answer

The product of voltage (V) and current (I)

Answer

The voltage (V) across the resistor

Answer

The current (I) through the resistor

Answer

The resistance (R) of the resistor

Question 18

What formula accurately describes the relationship between impedance (Z), resistance (R), inductive reactance (XL), and capacitive reactance (XC) in an AC circuit?

Accepted Answer

Z = √(R^2 + (XL - XC)^2)

Answer

Z = R + XL + XC

Answer

Z = R / (XL - XC)

Question 19

Which of the following is the SI unit of electric current?

Accepted Answer

Ampere (A)

Answer

Volt

Question 20

Ohm's law states that the current flowing through a conductor is:

Accepted Answer

Directly proportional to the voltage applied

Answer

Inversely proportional to the voltage applied

Question 21

A resistor is a circuit element that:

Accepted Answer

Limits the flow of current in a circuit

Answer

Stores electrical energy

Question 22

Which of the following is the time constant of an RC circuit?

Accepted Answer

1/RC

Question 23

Kirchhoff's current law states that the algebraic sum of the currents entering and leaving a junction is:

Accepted Answer

Zero

Answer

One

Question 24

The resonance frequency of an LCR circuit is:

Accepted Answer

The frequency at which the circuit has maximum current

Question 25

What is the purpose of a transformer?

Accepted Answer

To change the voltage level of an AC signal

Answer

To change the current level of an AC signal

Question 26

An electric motor converts:

Accepted Answer

Electrical energy into mechanical energy

Answer

Mechanical energy into electrical energy

Question 27

Based on Ohm's law, how does the current flowing through a resistor relate to the voltage and resistance?

Accepted Answer

Equal to the voltage divided by the resistance

Answer

Directly proportional to voltage and inversely proportional to resistance

Answer

Inversely proportional to voltage and directly proportional to resistance

Answer

Proportional to the square of voltage and inversely proportional to resistance

Question 28

Which electrical component serves as a temporary storage device for electrical energy, utilizing an electric field?

Accepted Answer

Capacitor

Answer

Resistor

Answer

Inductor

Answer

Diode

Question 29

Kirchhoff's voltage law states that the algebraic sum of the voltages around a closed loop in a circuit equals:

Accepted Answer

Zero

Answer

The voltage of the power source

Answer

The current in the circuit

Answer

The resistance in the circuit

Question 30

Inductors have the property of opposing changes in current flow. This opposition is manifested through the generation of:

Accepted Answer

A magnetic field

Answer

An electric field

Answer

A gravitational field

Answer

An electromagnetic field

Question 31

When measuring current in a circuit, which device is most appropriate?

Accepted Answer

Ammeter

Answer

Voltmeter

Answer

Ohmmeter

Answer

Capacitance meter

Question 32

In a parallel circuit configuration, the total current is:

Accepted Answer

Equal to the sum of the individual branch currents

Answer

Less than the current in any individual branch

Answer

Greater than the current in any individual branch

Answer

Equal to the current in the main circuit

Question 33

Which of the following mathematical equations best represents Ohm's law?

Accepted Answer

V = IR

Answer

I = VR

Answer

R = VI

Answer

R = IV

Question 34

What is the standard unit of measurement for electrical resistance in the International System of Units (SI)?

Accepted Answer

Ohm (Ω)

Answer

Ampere (A)

Answer

Volt (V)

Answer

Coulomb (C)

Question 35

What is the primary function of a capacitor in an alternating current (AC) circuit?

Accepted Answer

Stores electrical energy

Answer

Blocks the flow of current

Answer

Allows the flow of direct current only

Answer

Converts AC to DC

Question 36

Which of the following is not one of Kirchhoff's laws governing current and voltage in electrical circuits?

Accepted Answer

Power law

Answer

Current law

Answer

Voltage law

Answer

Loop law

Question 37

What is the primary purpose of using an inductor in a circuit?

Accepted Answer

To store magnetic energy

Answer

To increase the current flow

Answer

To decrease the current flow

Answer

To convert AC to DC

Question 38

Which of the following is the SI unit of electric resistance?

Accepted Answer

Ohm (Ω)

Answer

Volt (V)

Answer

Ampere (A)

Answer

Coulomb (C)

Question 39

Ohm's law states that the potential difference (voltage) across a resistor is:

Accepted Answer

Directly proportional to the current flowing through it

Answer

Inversely proportional to the current flowing through it

Answer

Independent of the current flowing through it

Question 40

A resistor is an electrical component that:

Accepted Answer

Opposes the flow of electric current

Answer

Measures electrical current

Answer

Stores electrical energy

Answer

Generates electrical energy

Question 41

An inductor is an electrical component that:

Accepted Answer

Stores energy in a magnetic field

Answer

Generates electrical current

Answer

Dissipates energy as heat

Answer

Stores energy in an electric field

Question 42

Kirchhoff's current law (KCL) states that:

Accepted Answer

The total current entering a junction is equal to the total current leaving it

Answer

The power in a circuit is equal to the product of voltage and current

Answer

The voltage across a closed loop is always zero

Question 43

In a series circuit, the components are connected:

Accepted Answer

End-to-end, with the same current flowing through each component

Answer

In parallel, with the same current flowing through each component

Answer

End-to-end, with the same voltage across each component

Answer

In parallel, with the same voltage across each component

Question 44

In a parallel circuit, the components are connected:

Accepted Answer

Across each other, with the same voltage across each component

Answer

End-to-end, with the same current flowing through each component

Answer

In parallel, with the same current flowing through each component

Answer

End-to-end, with the same voltage across each component

Question 45

A fuse is a safety device used in electrical circuits that:

Accepted Answer

Breaks the circuit when the current exceeds a certain safe value

Answer

Generates electrical current

Answer

Stores electrical energy

Question 46

According to Ohm's law, in an electric circuit, the current (I) flowing through a resistor is directly proportional to the:

Accepted Answer

Voltage (V) applied across it

Answer

Resistance (R) of the resistor

Answer

Capacitance (C) of the circuit

Answer

Power (P) dissipated by the resistor

Question 47

Which of the following is the unit of resistance?

Accepted Answer

Ohm

Answer

Henry

Answer

Siemens

Answer

Farad

Question 48

A capacitor is a device used in electric circuits that stores electrical energy in the form of:

Accepted Answer

Electric field

Answer

Gravitational field

Answer

Nuclear field

Answer

Magnetic field

Question 49

In a series circuit, the total resistance is:

Accepted Answer

Equal to the sum of the individual resistances

Answer

Equal to the largest individual resistance

Answer

Equal to the smallest individual resistance

Question 50

According to Kirchhoff's Current Law, the sum of the currents entering a junction is:

Accepted Answer

Equal to the sum of the currents leaving the junction

Answer

Greater than the sum of the currents leaving the junction

Answer

Less than the sum of the currents leaving the junction

Question 51

The SI unit of inductance is the:

Accepted Answer

Henry

Answer

Farad

Answer

Siemens

Answer

Ohm

Question 52

In a parallel circuit, the total resistance is:

Accepted Answer

Less than the smallest individual resistance

Answer

Equal to the sum of the individual resistances

Answer

Greater than the largest individual resistance

Question 53

The power dissipated by a resistor is given by the formula:

Accepted Answer

P = I^2R

Answer

P = V^2/R

Answer

P = IV

Answer

P = VI